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Taxes (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax provision at federal statutory corporate tax rate |  | 21.00% | 35.00% | 21.00% | 35.00% |
Decrease in effective tax rate |  | 7.00% | 18.00% | 7.00% | 18.00% |
Decrease in effective tax rate for difference between deduction for tax purposes and compensation cost recognized from stock option exercises |  | 1.00% | 9.00% | 5.00% | 19.00% |
Increase in reserves for income taxes, net of deferred tax benefit |  | $ 879 |  | $ 879 |  |
Interest and penalties included in reserve |  |  |  | 136 |  |
Liability for uncertain tax positions |  | 8,427 |  | 8,427 |  |
Reserve for income taxes classified as a noncurrent iability |  | 7,399 |  | 7,399 |  | $ 6,488
Reserve for income taxes classified an noncurrent deferred tax assets |  | 1,028 |  | 1,028 |  |
Interest and penalties, gross |  | $ 924 |  | 924 |  |
Minimum decrease in income tax expense due to release in reserves |  |  |  | 1,100 |  |
Maximum decrease in income tax expense due to release in reserves |  |  |  | $ 1,200 |  |
Tax years open to examination by Internal Revenue Service |  |  |  | 2014 through 2017 |  |
Tax years open to examination by various taxing authorities for other entities |  |  |  | 2013 through 2017 |  |
Foreign Tax Authority | Revenue Commissioners, Ireland |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax provision at federal statutory corporate tax rate |  |  |  | 12.50% |  |
Foreign Tax Authority | State Administration of Taxation, China |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax provision at federal statutory corporate tax rate |  |  |  | 25.00% |  |
Domestic Tax Authority |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax provision at federal statutory corporate tax rate |  |  |  | 21.00% |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 5,961 |  |  |  |  |

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